v3.26.1
Employee Benefits - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Mar. 31, 2026
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Defined Benefit Plan Disclosure [Line Items]        
Remeasurement gain (loss), net   $ 237    
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate   412    
Defined benefit plan, benefit obligation, actuarial gain (loss) from actuarial assumption adjustments   (175)    
Collective-bargaining agreement, term 4 years      
Employee Severance        
Defined Benefit Plan Disclosure [Line Items]        
Amount paid in severance benefits over the period   973    
Post employment benefits liability $ 699 699    
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Employer discretionary contribution amount   0 $ 0  
Remeasurement gain (loss), net   $ 18 0  
Defined benefit plan, assumptions used calculating benefit obligation, discount rate 5.90% 5.90%   5.70%
Defined benefit plan, benefit obligation, increase for plan amendment   $ 546    
Other comprehensive (income) loss, defined benefit plan, prior service cost (credit), after tax   (451)    
Other comprehensive income (loss), pension and other postretirement benefit plans, plan amendments, tax effect   151    
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Remeasurement gain (loss), net   $ 219 $ 0  
Defined benefit plan, assumptions used calculating benefit obligation, discount rate 5.70% 5.70%   5.40%
Defined benefit plan, benefit obligation, increase for plan amendment   $ 56